JPH04334610A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH04334610A JPH04334610A JP3135606A JP13560691A JPH04334610A JP H04334610 A JPH04334610 A JP H04334610A JP 3135606 A JP3135606 A JP 3135606A JP 13560691 A JP13560691 A JP 13560691A JP H04334610 A JPH04334610 A JP H04334610A
- Authority
- JP
- Japan
- Prior art keywords
- bead
- tire
- groove
- rim
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011324 bead Substances 0.000 claims abstract description 47
- 229920001971 elastomer Polymers 0.000 abstract description 12
- 239000005060 rubber Substances 0.000 abstract description 12
- 238000004073 vulcanization Methods 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000004760 aramid Substances 0.000 description 3
- 229920003235 aromatic polyamide Polymers 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000254043 Melolonthinae Species 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は加硫工程時におけるゴム
の流動性を高めるとともに、タイヤの仕上がりの見映え
を高め、しかもタイヤ自体にタイヤを識別できかつ区分
しうる識別性を具えることを可能とする空気入りタイヤ
に関する。[Industrial Application Field] The present invention improves the fluidity of rubber during the vulcanization process, improves the finished appearance of the tire, and provides the tire itself with distinctiveness that allows the tire to be identified and differentiated. Related to pneumatic tires that enable
【０００２】0002
【従来の技術】空気入りタイヤにあっては、ビード部は
、その内向き面であるビードベース面はリムのビードシ
ート部と、又外側面を形成するビードフランジ面はリム
のフランジにそれぞれ当接する。又前記ビードベース面
とビードフランジ面との交点であるヒール端近傍は、両
面を結ぶ円弧で形成されている。[Prior Art] In a pneumatic tire, the bead portion has an inwardly facing bead base surface that corresponds to the bead seat portion of the rim, and a bead flange surface that forms the outer surface that corresponds to the rim flange. come into contact with Further, the vicinity of the heel end, which is the intersection of the bead base surface and the bead flange surface, is formed by an arc connecting both surfaces.
【０００３】0003
【発明が解決しようとする課題】このような形状からな
るビード部のヒール部分は、タイヤの加硫時において、
ゴムの流動性が劣ることにより、ベアー又はゴム流れ不
良が生じがちであり、見映えが低下することが多々ある
。従来ではこのような、ベアー又はゴム流れ不良の発生
を防止するため、例えばベントホール等を設けていたが
、前記ベアー又はゴム流れ不良の発生を阻止することが
出来なかった。[Problems to be Solved by the Invention] The heel portion of the bead portion having such a shape is
Poor fluidity of rubber tends to cause bareness or poor rubber flow, often resulting in poor appearance. Conventionally, in order to prevent the occurrence of bare or rubber flow defects, for example, a vent hole or the like has been provided, but it has not been possible to prevent the bare or rubber flow defects from occurring.
【０００４】他方、空気入りタイヤにあっては、その装
着するリムの形状が異なる場合には、それぞれのリムに
適合するビード形状のものを複数種類製作し用意せねば
ならず、その識別が容易ではないという問題があった。On the other hand, when pneumatic tires are mounted on different rim shapes, it is necessary to manufacture and prepare multiple types of bead shapes that fit each rim, making it easy to identify them. The problem was that it wasn't.
【０００５】発明者は、ヒール部分に生じる変形を防止
すべく鋭意研究の結果、ヒール端の前記円弧部分に周方
向にのびる周溝を設けることにより、タイヤ加硫時にお
いてヒール部分の接触圧力を高めることが出来、その結
果ゴムの流動性が良好となり、外観不良を排除しうるこ
とを見出したのである。しかも前記目的により条設され
る周溝はその条数を違えることによりタイヤ自体を区分
しうる識別マークとしても利用しうることを見出したの
である。[0005] As a result of intensive research in order to prevent deformation occurring in the heel portion, the inventor has found that by providing a circumferential groove extending in the circumferential direction in the arcuate portion of the heel end, the contact pressure of the heel portion can be reduced during tire vulcanization. The inventors have discovered that the fluidity of the rubber can be improved and that poor appearance can be eliminated. Furthermore, the inventors have discovered that by varying the number of circumferential grooves provided for the above-mentioned purposes, they can also be used as identification marks to distinguish the tire itself.
【０００６】本発明は、ビード部のビードベース面とビ
ードフランジ面とを結ぶ円弧状のコーナ部に、１〜５本
の周溝を設けることを基本として、加硫時にヒール部分
に生じる歪みを排除しうることによって、タイヤの見映
えを向上しうるとともに、併せてタイヤの識別を可能と
する空気入りタイヤの提供を目的としている。[0006] The present invention is based on the provision of one to five circumferential grooves in the arc-shaped corner portion connecting the bead base surface and bead flange surface of the bead portion, thereby reducing the distortion that occurs in the heel portion during vulcanization. It is an object of the present invention to provide a pneumatic tire that can improve the appearance of the tire and also make it possible to identify the tire.
【０００７】[0007]
【課題を解決するための手段】本発明は、リムのビート
シート部に着座するビードベース面とリムのフランジに
当接するビードフランジ面とを結びかつ円弧面をなすコ
ーナ部に、タイヤ周方向にのびるとともに溝巾が０．１
ｍｍ以上かつ０．３ｍｍ以下、溝深さが０．１ｍｍ以上
かつ０．６ｍｍ以下、しかも１本以上かつ５本以下の周
溝を設けてなる空気入りタイヤである。[Means for Solving the Problems] The present invention provides a method for connecting a bead base surface that sits on a beat seat portion of a rim and a bead flange surface that abuts a flange of the rim and forming an arcuate corner portion in the circumferential direction of the tire. As it grows, the groove width decreases to 0.1
This pneumatic tire is provided with circumferential grooves having a groove depth of 0.1 mm or more and 0.6 mm or less, and 1 or more and 5 or less circumferential grooves.
【０００８】[0008]
【作用】ビードベース面とビードフランジ面とを結ぶ円
弧状のコーナ部に１〜５本の周溝を設けることによって
、加硫時におけるヒール部の接触圧力を高めることが出
来、その接触圧力が増大することによりゴムの流動性が
高まる結果、ヒール部に歪みが生じるのを阻止でき、見
映えを向上しうるのである。[Function] By providing 1 to 5 circumferential grooves in the arc-shaped corner connecting the bead base surface and bead flange surface, the contact pressure of the heel part during vulcanization can be increased, and the contact pressure can be increased. This increases the fluidity of the rubber, which prevents distortion in the heel portion and improves the appearance.
【０００９】前記周溝は、溝深さが０．１ｍｍ以下にな
れば加硫時において接触圧力を高めることが出来ずゴム
の流動性を向上し得ず、完成タイヤの見映えも劣る。溝
巾が０．６ｍｍをこえると走行時においてビード部か繰
返し変形することによりビード部に亀裂が生じやすく耐
久性に劣る。If the groove depth of the circumferential groove is less than 0.1 mm, the contact pressure cannot be increased during vulcanization, the fluidity of the rubber cannot be improved, and the appearance of the finished tire will be poor. If the groove width exceeds 0.6 mm, the bead portion will be repeatedly deformed during running, causing cracks to easily occur in the bead portion, resulting in poor durability.
【００１０】又溝巾が０．１ｍｍ未満では周溝を形成す
る加硫金型が破損しやすく、逆に０．３ｍｍをこえると
タイヤ走行に伴うビード部の変形に際してコーナ部に作
用する応力に不均等が生じビード部にクラックが生じる
など耐久性が低下する。[0010] If the groove width is less than 0.1 mm, the vulcanization mold forming the circumferential groove is likely to be damaged, while if it exceeds 0.3 mm, the stress acting on the corner portion when the bead portion deforms as the tire runs. Durability decreases due to unevenness and cracks in the bead.
【００１１】周溝は、その溝巾、溝深さが前記規制寸度
の範囲において、溝の長手方向線と直交する断面の形状
を、矩形の他開口部巾が底面巾よりも大きい台形状、さ
らには三角形状とすることも出来る。他方、周溝を５本
をこえて設けた場合にはビード部の変形に際してクラッ
クが生じる危険がある。[0011] When the circumferential groove has a groove width and a groove depth within the range of the above-mentioned regulation dimensions, the shape of the cross section perpendicular to the longitudinal direction of the groove may be rectangular or trapezoidal in which the opening width is larger than the bottom width. , or even a triangular shape. On the other hand, if more than five circumferential grooves are provided, there is a risk that cracks will occur when the bead portion deforms.
【００１２】なお周溝は周方向に連続して周回するもの
の他、単数又は複数個所に小長さの途切れ部を設けても
よいが、加硫時における歪みの発生を防ぐには連続する
周溝であることが好ましい。さらに周溝は１本の溝を渦
巻状にかつ５重以下の多重に巻回して形成することも出
来る。The circumferential groove may be continuous in the circumferential direction, or may be provided with small discontinuities at one or more places, but in order to prevent distortion during vulcanization, continuous circumferential grooves may be provided. Preferably, it is a groove. Furthermore, the circumferential groove can also be formed by winding a single groove spirally in five or less layers.
【００１３】このように周溝を形成しうるため、周溝の
本数、形状を違えることにより、タイヤ自体に周溝がな
す識別マークを付与することが可能となる。Since the circumferential grooves can be formed in this way, by varying the number and shape of the circumferential grooves, it is possible to give the tire itself an identification mark formed by the circumferential grooves.
【００１４】[0014]
【実施例】以下本発明の一実施例を図面に基づき説明す
る。図において空気入りタイヤ１は、ビード部７に、リ
ムＪのビードシート部Ｂに着座するビードベース面２と
、リムＪのフランジＦに当接するビードフランジ面３と
を有し、前記ビードベース面２とビードフランジ面３と
を結ぶとともに円弧面からなるコーナ部４に１本以上か
つ５本以下の周溝５を設けている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, a pneumatic tire 1 has a bead portion 7, a bead base surface 2 that seats on a bead seat portion B of a rim J, and a bead flange surface 3 that contacts a flange F of the rim J, and the bead base surface 2 and the bead flange surface 3, and a corner portion 4 formed of an arcuate surface is provided with one or more and five or less circumferential grooves 5.
【００１５】なお本実施例では前記ビードベース面２は
フランジＦ側が径の大きい１５°テーパとして形成され
ている。In this embodiment, the bead base surface 2 is tapered at 15° with a larger diameter on the flange F side.
【００１６】又タイヤ１は、トレッド部１２の両端から
タイヤ半径方向内方へのびるサイドウォール部１３、１
３と、該サイドウォール部１３の半径方向内側に位置す
る前記ビード部７、７とを有し、各ビード部７、７に設
けるビードコア１６、１６間には前記サイドウォール部
１３、１３、トレッド部１２を通るトロイド状のカーカ
ス１７が架け渡されるとともに、その半径方向外側かつ
トレッド部１２内にベルト層１９を配している。The tire 1 also has sidewall portions 13, 1 extending inward in the tire radial direction from both ends of the tread portion 12.
3 and the bead portions 7, 7 located on the radially inner side of the sidewall portion 13, and between the bead cores 16, 16 provided in each bead portion 7, 7, the sidewall portions 13, 13, the tread. A toroidal carcass 17 passing through the section 12 is spanned, and a belt layer 19 is disposed on the outside in the radial direction and within the tread section 12.
【００１７】前記カーカス１７は、カーカスコードをタ
イヤの赤道Ｃに対して本実施例では６０度〜９０度の角
度で配列したいわゆるラジアル又はセミラジアル方向配
列体であり、又カーカスコードとしてナイロン、ポリエ
ステル、レーヨン、芳香族ポリアミド等の繊維コードが
採用される。The carcass 17 is a so-called radial or semi-radial arrangement body in which the carcass cords are arranged at an angle of 60 degrees to 90 degrees with respect to the equator C of the tire, and the carcass cords are made of nylon or polyester. Fiber cords such as rayon, aromatic polyamide, etc. are used.
【００１８】前記ベルト層１９は、夫々のベルトプライ
に傾斜して配されかつ互いに交叉するベルトコードを具
え、該ベルトコードはカーカス１７と同様にナイロン、
ポリエステル、レーヨン、芳香族ポリアミド等の繊維コ
ードの他、スチールコードが用いられる。The belt layer 19 includes belt cords arranged obliquely on each belt ply and crossing each other, and the belt cords, like the carcass 17, are made of nylon,
In addition to fiber cords such as polyester, rayon, and aromatic polyamide, steel cords are used.
【００１９】又本実施例ではビード部７に、前記カーカ
ス１７を包む補強層２１が配され、該補強層２１はスチ
ールコード、芳香族ポリアミド等強度を有する有機繊維
コードを前記カーカス１７のカーカスコードと交わる向
きに並置したシート状をなし、この補強層２１によって
ビード部７の剛性を高めうる。In this embodiment, the bead portion 7 is provided with a reinforcing layer 21 that surrounds the carcass 17, and the reinforcing layer 21 is made of a strong organic fiber cord such as steel cord or aromatic polyamide. The reinforcing layer 21 can increase the rigidity of the bead portion 7.
【００２０】又ビード部２には、前記補強層２１の外側
に該ビード部２の外表面９を形成しうるチエーフアー２
２が配され、本実施例ではチエーフアー２２のゴムはビ
ード部７の他のゴムよりも高くその硬度ＪＩＳＡ硬度の
６５度以上に設定される。なお外表面９は、前記ビード
ベース面２とビードフランジ面３とコーナ部４とを含む
。The bead portion 2 also has a chafer 2 that can form the outer surface 9 of the bead portion 2 outside the reinforcing layer 21.
2, and in this embodiment, the rubber of the chauffeur 22 is set to have a hardness higher than that of the other rubbers of the bead portion 7, and has a JISA hardness of 65 degrees or more. Note that the outer surface 9 includes the bead base surface 2, the bead flange surface 3, and the corner portion 4.
【００２１】コーナ部４には前記した如くタイヤ周方向
にのびる周溝３が設けられる。本実施例ではタイヤ軸を
中心とした同芯に配される３本の周溝３、３、３を有し
、各周溝３は溝断面を略同一としかつ矩形断面に形成さ
れる。As described above, the corner portion 4 is provided with the circumferential groove 3 extending in the circumferential direction of the tire. In this embodiment, three circumferential grooves 3, 3, 3 are arranged concentrically around the tire axis, and each circumferential groove 3 has substantially the same groove cross section and is formed in a rectangular cross section.
【００２２】[0022]
【発明の効果】叙上の如く本発明の空気入りタイヤは、
ビードベース面とビードフランジ面とを結び円弧状のコ
ーナ部に溝巾と溝深さとを規制した１〜５本からなる周
溝を設けたため、タイヤ加硫時におけるゴムの流動性を
高めタイヤの仕上がり外観を向上するとともに、周溝の
構成及び本数を違えることによりタイヤの構成、性能の
差異を示す識別性をタイヤ自体に設けることが可能とな
る。[Effects of the Invention] As mentioned above, the pneumatic tire of the present invention has
A circumferential groove consisting of 1 to 5 grooves with regulated groove width and groove depth is provided in the arc-shaped corner that connects the bead base surface and bead flange surface, thereby increasing the fluidity of the rubber during tire vulcanization. In addition to improving the finished appearance, by varying the configuration and number of circumferential grooves, it is possible to provide the tire itself with distinctiveness that indicates differences in tire configuration and performance.
【図１】本発明の一実施例を示すタイヤ右半分断面図で
ある。FIG. 1 is a right half sectional view of a tire showing an embodiment of the present invention.
【図２】そのビード部を拡大して示す断面図である。FIG. 2 is an enlarged cross-sectional view of the bead portion.
【図３】周溝を例示する斜視図である。FIG. 3 is a perspective view illustrating a circumferential groove.
２ ビードベース面 ３ ビードフランジ面 ４ コーナ部 ５ 周溝 Ｂ ビードシート部 Ｆ フランジ Ｊ リム 2 Bead base surface 3 Bead flange surface 4 Corner section 5 Circumferential groove B Bead seat part F Flange J rim
Claims (1)
ース面とリムのフランジに当接するビードフランジ面と
を結びかつ円弧面をなすコーナ部に、タイヤ周方向にの
びるとともに溝巾が０．１ｍｍ以上かつ０．３ｍｍ以下
、溝深さが０．１ｍｍ以上かつ０．６ｍｍ以下、しかも
１本以上かつ５本以下の周溝を設けてなる空気入りタイ
ヤ。Claim 1: A groove extending in the circumferential direction of the tire and having a groove width of 0.1 mm is provided at a corner portion forming an arcuate surface connecting the bead base surface that seats on the beat seat portion of the rim and the bead flange surface that contacts the flange of the rim. A pneumatic tire having circumferential grooves with a groove depth of 0.1 mm or more and 0.6 mm or less, and a groove depth of 1 or more and 5 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135606A JPH04334610A (en) | 1991-05-09 | 1991-05-09 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135606A JPH04334610A (en) | 1991-05-09 | 1991-05-09 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04334610A true JPH04334610A (en) | 1992-11-20 |
Family
ID=15155749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3135606A Pending JPH04334610A (en) | 1991-05-09 | 1991-05-09 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04334610A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020039990A (en) * | 2000-11-23 | 2002-05-30 | 조충환 | Pneumatic tire |
| KR100493661B1 (en) * | 2000-12-19 | 2005-06-03 | 한국타이어 주식회사 | Pneumatic tire for heavy duty vehicle |
| KR100517174B1 (en) * | 2003-01-27 | 2005-09-26 | 한국타이어 주식회사 | Pneumatic tire for heavy duty vehicle |
| JP2007022218A (en) * | 2005-07-13 | 2007-02-01 | Yokohama Rubber Co Ltd:The | Pneumatic tire and its vulcanizing die |
| EP3782826A1 (en) * | 2019-08-22 | 2021-02-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire and tire mold |
| US20210331531A1 (en) * | 2018-10-30 | 2021-10-28 | Compagnie Generate Des Etablissements Michelin | A tire having recesses in bead area |
-
1991
- 1991-05-09 JP JP3135606A patent/JPH04334610A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020039990A (en) * | 2000-11-23 | 2002-05-30 | 조충환 | Pneumatic tire |
| KR100493661B1 (en) * | 2000-12-19 | 2005-06-03 | 한국타이어 주식회사 | Pneumatic tire for heavy duty vehicle |
| KR100517174B1 (en) * | 2003-01-27 | 2005-09-26 | 한국타이어 주식회사 | Pneumatic tire for heavy duty vehicle |
| JP2007022218A (en) * | 2005-07-13 | 2007-02-01 | Yokohama Rubber Co Ltd:The | Pneumatic tire and its vulcanizing die |
| US20210331531A1 (en) * | 2018-10-30 | 2021-10-28 | Compagnie Generate Des Etablissements Michelin | A tire having recesses in bead area |
| EP3782826A1 (en) * | 2019-08-22 | 2021-02-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire and tire mold |
| US11529829B2 (en) | 2019-08-22 | 2022-12-20 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire and tire mold |
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